What the manual says
Manufacturer manualRequested temperature reached: The boiler controller may temporarily block the heat request. The block occurs because the required temperature has been reached.
From this model's manual
Verified against the Daikin Ekomb 22 Combi installation & service manual, page 47.
DIY fix possible
Wait a few minutes for the boiler to restart automaticallyCheck that your room thermostat is set to a temperature higher than the current room temperatureEnsure radiator valves are open to allow heat to dissipate
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